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Logitech K400 Plus/SLES on Raspberry Pi 3 - activate module?

This question arose in an earlier thread with other issues. I'm starting a new thread to separate it from the other issues, and with some additional information.

I'm running SLES 12, aarch64, on a Raspberry Pi 3. On both Raspbian and Fedora running on the Pi, the OS saw the K400 Plus keyboard on first boot, and that keyboard/trackpad worked just fine. On SLES 12, it didn't see the K400+ (apparently), and I've had to plug in a USB kbd & mouse to do any work. I'd like to try (again) to get the K400+ working on SLES -- I'm liking SLES, but I really need to get rid of the USB devices on my Pi.

I did find and install the Solaar package. WARNING: the version from the SUSE repository is outdated, even though the version numbers are the same! Go to the Github repository ( https://github.com/pwr/Solaar ) and download the zip from there; unzip it; connect to the Solaar master directory; and run the setup.py program there ("build" and then "install"). The updated version on Github includes support for the K400+.

The problem is that Solaar is used to pair and configure Logitech devices. It isn't the driver for kbd/mouse that the kernel needs. That driver appears to be loaded as a module, but the keyboard still doesn't work. The kbd/trackpad are paired to the USB wireless dongle, and Solaar sees and can configure it just fine, but the kbd doesn't interact with the OS.